A US woman who shot and killed her husband and two adult children before taking her own life is thought to have committed the shocking crime as a result of being ostracised from the religion she was raised in.

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Hours later, Ms Redmond released a statement saying she had answered some questions incorrectly and wished to correct the record.

"It is not Liberal Party policy to reduce the public service by 20,000 or more," she said.

"While the party wants to reduce the cost of government in order to reduce the cost of living, a specific public service reduction figure has not been adopted as policy."

She said the party's policy was to establish an audit commission to report to the cabinet on any job cuts.

Ms Redmond said that in her earlier interview she said she did not envisage cuts seen to the extent in Queensland, where Premier Campbell Newman has announced a 14,000 reduction out of a public sector of about 200,000.

In response to Ms Redmond's original statement, SA Unions vice-president Joe Szakacs said the proposal was a disgrace and would hit frontline services with one in four jobs at risk.

"The South Australian Liberals are basically announcing deeper cuts than Queensland," he said.

"More than one in four teachers, nurses, firefighters, police, cleaners, tram drivers, speech pathologists, radiographers and others who work in our hospitals, schools and other public services will face the sack under her plan."

Also on Thursday, Ms Redmond criticised the state Labor government's efforts to cut public sector jobs through voluntary redundancies, arguing too many workers aged over 60 were being paid to leave.

"A more efficient approach would surely have been to target other groups with packages and allow natural attrition to account for those in the over-60s bracket," she said.

South Australian Premier Jay Weatherill said Ms Redmond's plans to cut jobs demonstrated a fundamental lack of understanding about the structure of the public service and how essential services were delivered.

"To propose that we would sack tens of thousands of state public servants and have that prospect hanging over their heads in the future demonstrates a complete lack of judgment," the premier said.